CN219041405U - Marine wind power plant transmission wiring structure compatible with power frequency and low frequency - Google Patents
Marine wind power plant transmission wiring structure compatible with power frequency and low frequency Download PDFInfo
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- CN219041405U CN219041405U CN202223154891.5U CN202223154891U CN219041405U CN 219041405 U CN219041405 U CN 219041405U CN 202223154891 U CN202223154891 U CN 202223154891U CN 219041405 U CN219041405 U CN 219041405U
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Abstract
The utility model discloses a power transmission wiring structure compatible with power frequency and low frequency of an offshore wind farm, which comprises the offshore wind farm, an offshore booster station and an onshore frequency conversion station; the electric energy generated by a plurality of offshore wind turbines of the offshore wind farm is sent out to a power frequency power grid after boosting and frequency conversion. Each offshore wind turbine generator is connected with an offshore booster station through a current collecting circuit; the offshore booster station is connected with the onshore frequency conversion station through a high-voltage submarine cable; the offshore wind farm is provided with a third power frequency bypass; the offshore booster station is provided with a second power frequency bypass first power frequency parallel branch and a second power frequency high reactance; the land frequency conversion station is provided with a first power frequency bypass, a first power frequency high reactance and SVG; when the frequency conversion valve fails, electric energy is connected into a power frequency power grid through the first power frequency bypass, the second power frequency bypass, the third power frequency bypass, the first power frequency parallel branch, the first power frequency high reactance, the second power frequency high reactance and the SVG. The utility model can meet the requirements of long-distance and large-capacity power transmission and simultaneously greatly improve the overall reliability of the system.
Description
Technical Field
The utility model relates to the technical field of power transmission, in particular to a power transmission wiring structure compatible with power frequency and low frequency of an offshore wind farm.
Background
In the prior art, the power frequency alternating current transmission technology is the most main technology of the offshore wind farm grid connection, and has the greatest advantages that the offshore wind farm transmission wiring type is simple in structure and high in system reliability, but the capacity current of a submarine cable can obviously reduce the capacity of the cable for transmitting active power, so that the offshore wind farm grid connection technology is generally used for short-distance and small-capacity transmission.
In practical application, a flexible direct current transmission scheme is adopted for the long-distance large-capacity offshore wind power transmission project, but a converter station and an offshore converter platform are required to be arranged at two ends of a direct current line, a true bipolar system is required to be adopted for approaching the reliability of a conventional alternating current transmission wiring mode, and the engineering investment and operation and maintenance cost are very high.
The low-frequency power transmission technology is used as a novel efficient power transmission technology, the power transmission distance of the submarine cable can be increased by reducing the frequency of the alternating-current power transmission line, and meanwhile, a marine converter station and a converter platform are not required to be built, so that the novel efficient power transmission technology has technical and economical advantages in a medium-and-long-distance offshore wind power transmission scene.
However, the reliability of low-frequency power transmission is still dependent on a valve module consisting of IGBT or IGCT and a cooling system thereof, the operation and maintenance work is far greater than that of static equipment, and the situation of fault and outage is difficult to avoid.
Therefore, how to meet the requirements of long-distance and large-capacity power transmission and improve the overall reliability of the system to the level of the conventional power frequency alternating current power transmission wiring mode without greatly increasing investment becomes a technical problem to be solved by the technicians in the field.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the utility model provides a power transmission wiring structure compatible with power frequency and low frequency for an offshore wind farm, and the purpose of realizing the power transmission wiring structure is to take both power frequency transmission and low frequency transmission into consideration, so that the overall reliability of the system can be greatly improved while the requirements of long-distance and large-capacity power transmission are met.
In order to achieve the purpose, the utility model discloses a power transmission wiring structure of an offshore wind farm compatible with power frequency and low frequency, which comprises the offshore wind farm, an offshore booster station and an onshore frequency conversion station; the electric energy generated by a plurality of offshore wind turbines of the offshore wind farm sequentially passes through the offshore booster station and the onshore frequency conversion station, and is sent to a power frequency power grid after boosting and frequency conversion.
Each offshore wind turbine generator is connected with the offshore booster station through a current collecting circuit which is universal with power frequency at low frequency;
the offshore booster station is connected with the land frequency conversion station through a high-voltage submarine cable which is universal with the power frequency and the low frequency;
the offshore wind farm is provided with a third power frequency bypass;
the offshore booster station is provided with a second power frequency bypass, a first power frequency parallel branch and a second power frequency high reactance;
the land frequency conversion station is provided with a first power frequency bypass, a first power frequency high reactance and SVG;
when a frequency conversion valve in the land frequency conversion station fails, the electric energy is connected into the power frequency power grid through the first power frequency bypass, the second power frequency bypass, the third power frequency bypass, the first power frequency parallel branch, the first power frequency high reactance, the second power frequency high reactance and the SVG.
Preferably, each offshore wind turbine generator comprises a converter, a third boost converter, a variable frequency power supply for self-power utilization of a fan and a corresponding third power frequency bypass, wherein the converter is universal with the power frequency low frequency;
the variable frequency power supply for self-power utilization of the fan is only put into use at low frequency.
More preferably, each of the rated capacity and the size of the third boost converter, and the corresponding transformer leakage control are matched with the power frequency low frequency.
Preferably, the offshore booster station comprises the power distribution device, a second boost transformer universal for power frequency low frequency and a ground station transformer universal for power frequency low frequency;
the power distribution device comprises a high-voltage power distribution device which is universal for power frequency and low frequency, a medium-voltage power distribution device which is universal for power frequency and low frequency and a low-voltage power distribution device for power frequency;
the output loop of the high-voltage distribution device is connected with the second power frequency high reactance through a first power frequency parallel branch;
the low-voltage distribution device is connected with a matched variable-frequency power supply and the second power frequency bypass in series on the low-voltage side of the grounding station;
the variable frequency power supply is only put into use at low frequency.
More preferably, the rated open-circuit and short-circuit current of the circuit breaker of the power distribution device, the rated capacity and the size of the second boost transformer, and the corresponding magnetic leakage control of the transformer are matched with the power frequency low frequency.
More preferably, the high-voltage distribution devices are in one-to-one correspondence with the wiring patterns of the low-frequency high-voltage distribution devices of the land frequency conversion station;
the wiring patterns include a line transformer group wiring, an inner bridge wiring, a single bus wiring, and a single bus segment wiring.
Preferably, the land frequency conversion station comprises a first boost transformer, the SVG, a power frequency station transformer, a first power frequency high reactance, a power frequency distribution device, a power frequency valve side distribution device, a starting resistor, a low frequency high voltage distribution device, a low frequency valve side distribution device, a low frequency buck transformer, an energy consumption device, a current limiting reactance and a frequency conversion valve which are all commonly used with the power frequency low frequency;
the power frequency distribution device comprises a power frequency high-voltage distribution device, a power frequency medium-voltage distribution device and a power frequency low-voltage distribution device;
the first power frequency high reactance and the SVG are put into use only when in power frequency operation;
the energy consumption device, the current limiting reactance and the frequency conversion valve are only put into use at low frequency.
Preferably, the number of the first power frequency high reactance corresponds to the number of outgoing loops of the land frequency conversion station;
the number of the second power frequency high reactance corresponds to the number of outgoing loops of the offshore booster station.
The utility model has the beneficial effects that:
the utility model can take both power frequency transmission and low frequency transmission modes into consideration, and can greatly improve the overall reliability of the system while meeting the requirements of long-distance and large-capacity power transmission.
The conception, specific structure, and technical effects of the present utility model will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present utility model.
Drawings
Fig. 1 shows a schematic structural diagram of an embodiment of the present utility model.
Detailed Description
Examples
As shown in fig. 1, the power transmission wiring structure of the offshore wind farm compatible with power frequency and low frequency comprises an offshore wind farm 1, an offshore booster station 2 and an onshore frequency conversion station 3; the electric energy generated by a plurality of offshore wind turbines 4 of the offshore wind farm 1 sequentially passes through an offshore booster station 2 and an onshore frequency conversion station 3, and is sent to a power frequency power grid after boosting and frequency conversion.
Each offshore wind turbine generator 4 is connected with an offshore booster station 2 through a current collecting circuit 5 which is universal with power frequency at low frequency;
the offshore booster station 2 is connected with the onshore frequency conversion station 3 through a high-voltage submarine cable 6 which is universal with the power frequency at low frequency;
the offshore wind farm 1 is provided with a third power frequency bypass 7;
the offshore booster station 2 is provided with a second power frequency bypass 8, a first power frequency parallel branch 35 and a second power frequency high reactance 9;
the land frequency conversion station 3 is provided with a first power frequency bypass 10, a first power frequency high reactance 11 and an SVG12;
when the frequency conversion valve 34 in the land frequency conversion station 3 fails, electric energy is connected into a power frequency power grid through the first power frequency bypass 10, the second power frequency bypass 8, the third power frequency bypass 7, the first power frequency parallel branch 35, the first power frequency high reactance 11, the second power frequency high reactance 9 and the SVG 12.
According to the utility model, the electric energy generated by each offshore wind turbine generator 4 is transmitted to the offshore booster station 2 through the power frequency low-frequency universal current collecting line 5, is boosted by the offshore booster station 2 through the power frequency low-frequency universal second booster transformer 16, is transmitted to the land frequency conversion station 3 through the power frequency low-frequency universal sea cable 6, is converted by the land frequency conversion station 3 and is transmitted to the power frequency power grid, and when the frequency conversion equipment fails, all the first power frequency bypass 10, the second power frequency bypass 8, the third power frequency bypass 7, the first power frequency high reactance 11, the first power frequency parallel branch 35, the second power frequency high reactance 9 and the SVG12 are input into the power frequency power grid again, so that two modes of power frequency transmission and low-frequency transmission are considered, and the overall reliability of the system can be greatly improved while the long-distance and large-capacity power transmission requirements are met.
In some embodiments, each offshore wind turbine 4 comprises a current transformer 13 which is universal with power frequency low frequency, a third boost transformer 14, a variable frequency power supply 15 for self-power utilization of a fan and a corresponding third power frequency bypass 7;
the variable frequency power supply 15 for self-power-consumption of the fan is only put into use at low frequency.
In some embodiments, the rated capacity and size of each third boost converter 14, and the corresponding transformer leakage control, are matched to the low frequency of the power frequency.
Preferably, the offshore booster station 2 comprises a power distribution device, a second booster transformer 16 which is universal for power frequency and low frequency, and a grounding station transformer 17 which is universal for power frequency and low frequency;
the power distribution devices comprise a high-voltage power distribution device 18 which is universal for power frequency and low frequency, a medium-voltage power distribution device 19 which is universal for power frequency and low-voltage power distribution device 20 which is used for power frequency;
the output loop of the high-voltage distribution device 18 is connected with a second power frequency high-impedance 9 through a first power frequency parallel branch 35;
the low-voltage distribution device 20 is connected with a matched variable-frequency power supply 21 and a second power frequency bypass 8 in series on the low-voltage side of the grounding station transformer 17;
the variable frequency power supply 21 is put into operation only at low frequencies.
More preferably, the circuit breaker rating of the power distribution device opens and closes the short circuit current, and the rated capacity and size dimensions of the second boost converter 16, and the corresponding transformer leakage control, are matched to the power frequency low frequency.
More preferably, the high-voltage distribution devices 18 are in one-to-one correspondence with the wiring patterns of the low-frequency high-voltage distribution devices 29 of the land-based frequency conversion station 3;
the wiring patterns include wire change group wiring, inner bridge wiring, single bus wiring, and single bus segment wiring.
Preferably, the land frequency conversion station 3 comprises a first boost transformer 22, an SVG12, a power frequency station transformer 23, a first power frequency high reactance 11, a power frequency distribution device, a power frequency valve side distribution device 27, a starting resistor 28, a low frequency high voltage distribution device 29 matched with the power frequency low frequency, a low frequency valve side distribution device 30, a low frequency buck transformer 31, an energy consumption device 32, a current limiting reactance 33 and a frequency conversion valve 34 which are commonly used with the power frequency low frequency;
the power frequency distribution device comprises a power frequency high-voltage distribution device 26, a power frequency medium-voltage distribution device 25 and a power frequency low-voltage distribution device 24;
the first power frequency high reactance 11 and the SVG12 are only put into use when in power frequency operation;
the energy consuming device 32, the current limiting reactance 33 and the frequency converter valve 34 are only put into operation at low frequencies.
Preferably, the number of the first power frequency high reactance 11 corresponds to the number of outgoing loops of the land frequency conversion station 3;
the number of the second power frequency high reactance 9 corresponds to the number of outgoing loops of the offshore booster station 2.
The foregoing describes in detail preferred embodiments of the present utility model. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the utility model by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The power transmission wiring structure compatible with power frequency and low frequency of the offshore wind farm comprises an offshore wind farm (1), an offshore booster station (2) and an onshore frequency conversion station (3); the electric energy generated by a plurality of offshore wind turbines (4) of the offshore wind farm (1) sequentially passes through the offshore booster station (2) and the onshore frequency conversion station (3), and is sent to a power frequency power grid after boosting and frequency conversion; the method is characterized in that:
each offshore wind turbine generator (4) is connected with the offshore booster station (2) through a current collecting circuit (5) which is universal with the power frequency at low frequency;
the offshore booster station (2) is connected with the land frequency conversion station (3) through a high-voltage submarine cable (6) which is universal with the power frequency at low frequency;
the offshore wind farm (1) is provided with a third power frequency bypass (7);
the offshore booster station (2) is provided with a second power frequency bypass (8), a first power frequency parallel branch (35) and a second power frequency high reactance (9);
the land frequency conversion station (3) is provided with a first power frequency bypass (10), a first power frequency high reactance (11) and an SVG (12);
when a frequency conversion valve (34) in the land frequency conversion station (3) fails, the electric energy is connected into the power frequency power grid through the first power frequency bypass (10), the second power frequency bypass (8), the third power frequency bypass (7), the first power frequency parallel branch (35), the first power frequency high reactance (11), the second power frequency high reactance (9) and the SVG (12).
2. The offshore wind farm power transmission wiring structure compatible with power frequency and low frequency according to claim 1, wherein each offshore wind turbine generator (4) comprises a current transformer (13) which is universal with the power frequency and low frequency, a third boost transformer (14), a variable frequency power supply (15) for self-power consumption of a fan and a corresponding third power frequency bypass (7);
the variable frequency power supply (15) for self-power utilization of the fan is only put into use at low frequency.
3. The offshore wind farm power transmission connection structure compatible with power frequencies and low frequencies according to claim 2, wherein the rated capacity and size dimensions of each third boost converter (14), and the corresponding transformer leakage control, are matched to the power frequency low frequencies.
4. The power frequency and low frequency compatible offshore wind farm power transmission wiring structure according to claim 1, wherein the offshore booster station (2) comprises a power distribution device, a second boost transformer (16) for power frequency low frequency and a ground station transformer (17) for power frequency low frequency;
the power distribution device comprises a high-voltage power distribution device (18) which is universal for power frequency and low frequency, a medium-voltage power distribution device (19) which is universal for power frequency and low frequency and a low-voltage power distribution device (20) which is used for power frequency;
the output loop of the high-voltage distribution device (18) is connected with the second power frequency high reactance (9) through a first power frequency parallel branch (35);
the low-voltage distribution device (20) is connected with a matched variable-frequency power supply (21) and the second power frequency bypass (8) in series on the low-voltage side of the grounding station transformer (17);
the variable frequency power supply (21) is only put into use at low frequencies.
5. The offshore wind farm transmission connection structure compatible with power frequencies and low frequencies according to claim 4, wherein the circuit breaker of the power distribution device is rated to open and short circuit current, the rated capacity and size of the second boost converter (16), and the corresponding transformer leakage control are matched with the power frequency low frequencies.
6. The power frequency and low frequency compatible offshore wind farm power transmission wiring structure according to claim 4, wherein the high voltage distribution devices (18) are in one-to-one correspondence with wiring patterns of low frequency high voltage distribution devices (29) of the land frequency conversion station (3);
the wiring patterns include a line transformer group wiring, an inner bridge wiring, a single bus wiring, and a single bus segment wiring.
7. The offshore wind farm power transmission wiring structure compatible with power frequency and low frequency according to claim 1, wherein the land frequency conversion station (3) comprises a first boost transformer (22), the SVG (12), a power frequency station transformer (23), the first power frequency high reactance (11), a power frequency power distribution device, a power frequency valve side power distribution device (27), a starting resistor (28), and a low frequency high voltage power distribution device (29), a low frequency valve side power distribution device (30), a low frequency buck transformer (31), an energy consumption device (32), a current limiting reactance (33) and a frequency conversion valve (34) which are all commonly used with the power frequency low frequency;
the power frequency distribution device comprises a power frequency high-voltage distribution device (26), a power frequency medium-voltage distribution device (25) and a power frequency low-voltage distribution device (24);
the first power frequency high reactance (11) and the SVG (12) are only put into use when in power frequency operation;
the energy consumption device (32), the current limiting reactance (33) and the frequency conversion valve (34) are only put into use at low frequencies.
8. The offshore wind farm power transmission wiring structure compatible with power frequency and low frequency according to claim 1, wherein the number of the first power frequency high reactance (11) corresponds to the loop number of outgoing lines of the land frequency conversion station (3);
the number of the second power frequency high reactance (9) corresponds to the number of outgoing loops of the offshore booster station (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223154891.5U CN219041405U (en) | 2022-11-25 | 2022-11-25 | Marine wind power plant transmission wiring structure compatible with power frequency and low frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223154891.5U CN219041405U (en) | 2022-11-25 | 2022-11-25 | Marine wind power plant transmission wiring structure compatible with power frequency and low frequency |
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| CN219041405U true CN219041405U (en) | 2023-05-16 |
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| CN202223154891.5U Active CN219041405U (en) | 2022-11-25 | 2022-11-25 | Marine wind power plant transmission wiring structure compatible with power frequency and low frequency |
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| CN (1) | CN219041405U (en) |
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